Flat-slab construction



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Aug.. 18, 1925.

R- M.HARDISON FLAT SLAB CONSTRUCTION Filed May 24, l1921 3 sheets-sheet 2 Aug. 18, i925.

. R. M. HADSN FLAT SLAE CONSTRUCTION Filed May 24, i921 5 Sheets-Sheet 3 Patented Aug. 18, 1925.

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PATENT omnes.

ROBERT 1v1. HAaDIsoN, on' Bo'sron, ivmssaonnsn'rcrs, AssIeNoa, BY MnsNE .essieu- A'M'ENTS, 'ro' KALMAN DELAWARE.

STEELCOMPANY, OF CHICAGO, ILLINOIS,'A CORPORATION OF FLAT-SLAB oousrnucronf Application and May ai, 1921. serial Hofmann.

To all 107mm t 77mg/ concern.: y

Be it known that L'Ronn'r M. HARDIsoN, a citizen of the United States, and a resident of Boston, in thecounty of Suilollr andState of Massachusetts, have invented an Improvement in Flat-Slab Constructions, of which the following description, in con nection with the accompanying drawingrs,

is a specification, like characters on the drawings representing like parts.

This invention relates to reinforced con crete-construction and more particularly to fiat-slab constructions, that is to say, to that type of building construction employing a reinforced `concrete slab in which the load upon the floor is carried directly to the slabs supporting member, which may` be a column or-,any other suitable support.

The invention and its aims and objects will be lreadily understood from the follow ing` description, taken -in connection with the accompanying drawings of several illustrative embodiments of the invention, the invention in its true scope being more particu larly set forthin the appended claims.

In the drawings:v

Fig. l is a top plan view of a construction embodying an illustrative form of the invention, certain parts being shown in sec tion;

` Fig. 2 is ay lateral, sectional elevation of the construction shown in Fig. l, on line l 24-2 ofgsaid figure;

Fig'. l() is a vertical sectional elevation,`

illustrating the application of the invention to wall beanie, when the wall columns are not in alignment with interior columns; and Fig'. 1l is a top plan view of the construeA tion shown in 10.

In carryingout my invention, Iprovide va' metal head contained inthe slaband prefW erably 'anchored therein,l yand a vertical structural member contained, and preferably anchored in the column or other support,

the said `head being secured or anchored to.

the said vertical member. The headimay be of any suitabley shape andstructure, solid or of more or less composite structure and ot' annular, polygonal or any other suitable contour.. The structural member may 'consist ot a single piece suchy as an H-iron or iron of any other suitable shape, or it may' becomposite consisting of, for example, connected rods or other irons. Any'suitable types of structural connections may be used, the diiierent types of columns. i

Referring to Figs. l to 3, wherein the sup port consists of a column, the vertical str`uctural member anchored in the concrete columnQ consisting` of an H-iron 4, while the head anchored in the slab 6 is of composite structure, consisting of aA spider-lile construction and comprises two iron plates 8 and l0, herein disc shaped, each having a central oblong opening` through which extends the H-iron 4 forming' the vertical member. The discs are securedto the web l2 and flange-s 14, 14 of the AH-iron, .forming the vertical member, by four angle irons 16, 15, 16, 16, bolted rat their opposite ends to said disc-s 8 'and l0 and to the web and flanges of said vertical H-iron member as shown at 18. The two plates or discs 8 and l0 are spaced apart sufficiently to receive benv tween them the inner endportions of radi-y ally extending; members, herein comprised ot smaller Heron i members 2O. Herein tv-.felve such radial members are provided, but any suitable number may be used... The inner endportions of said radially disposed hie-irons 2() are secured by their iianges to said dises by bolts as shown at 22. The vertical member 4 will kpreferably extend above connections necessarily varying with the Cil and below the floor, but this is not essential; in the case of an upper floor or a roof, for example, it will extend only below the floor or roof. The vertical members connected to the heads of successive floors may be interconnected..

Referring to Figs. 4 and 5, therein the vertical structural member anchored in the concrete column 2 comprises a series of steel or iron rods 24 extending longitudinally of the column 2 within the latter. In the illustrative embodiment of the invention shown in these two figures, these rods are divided into two series, each series disposed in a circle, the lower screwthreaded ends 30 of the upper series secured in the top plate 26 of the head by nuts 28-28 screwed onto said screw-threaded ends upon opposite sides of said plate. The lower series are secured by their upper screw-threaded ends in the lower plate 30 of said head by nuts 32, disposed similarly to the nuts 28. The free ends of said rods may be bent or turned inwardly as shown in Fig. 5 to give additional purchase.

The head is similar in construction to the head shown in Figs. l to 3 and comprises the two plates or discs 26 and 30 referred to parallel to each other and spaced sulficiently to receive. the inner ends of radial steel or iron members These members, as herein shown, consist of H-irons and their inner ends are secured to the plates or discs 26 and 30 by bolts as shown at 36, said bolts extending through said plates and through the flanges of said radial members. There are also provided four other radially disposed members 38, which extend practically to the center of the plates 26, 30, the inner ends of two of said members 38 which are in alignment with each other being secured to the inner ends of the two other members 38, which are also in alignment with each other, by angle irons 40 and bolts 42 by which the webs of these four radial members 38 are rigidly secured together. The flanges of one pair of these radial members 38 are cut away for a certain distance from their inner ends so as to enable the webs thereof to be brought into position to be secured, as above described, to the webs of the other two members 38 by the angle irons. Preferably these four radial members 38 will also be secured to both plates or discs by bolts 44.

In the construction shown in Figs. 4 and 5 the structural member also extends above and below the fioor. rl`his however is not essential and either the upper or the lower series of rods 24 may be omitted under certain conditions, as the case may be; for example in the case of the uppermost iioor, or in the case of a roof, the upper series of rods 24 may be omitted. rl`he vertical rods 24 of the members of different floors may be interconnected.

My invention is applicable to columns of all kinds. In Figs. 6 to 9 I have shown two illustrative applications thereof to wall columns. In Figs. 6 and 7 the structural member anchored in the wall column 50 consists of an I-iron 52 to which the head, anchored in the slab 54, is secured. Herein the head comprises a plurality of smaller Lbeams, bolted by their iianges to plates 55-55 between which their inner ends extend, these plates being in turn secured to the web of the I-iron 52 by angle irons 56-56 and bolts 58. The usual beam is shown at 59.

In Figs. 8 and 9 the head comprises a plurality of I-irons 58 bolted, as at 60, to plates 62, 62 between which they extend, the structural member encased in the column consisting of iron rods 64 extending upwardly and downwardly from said plates to which their inner screw-threaded ends are secured by nuts 66 upon opposite sides of said plates.

In Figs. 10 and ll the invention is shown in its application to a construction where the wall columns are not in alignment with the interior columns. In such cases the structural member, which in the previously described embodiments, is encased in the column itself, is encased or anchored in the wall beam 68 extending from one wall column to another, and which forms the immediate support. In other respects the construction may be the same as that shown in Figs. 8 and 9, the head comprising Lbeams 70 secured by bolts 7 2 to plates 74 to which rods 7 6, forming the structural member anchored in the beam are secured by nuts T8 in a manner similar to that shown in said Figs. 8 and 9. In all of these constructions additional members, such as may be used to provide additional bearing or anchorage, as shown in Figs. 10 and 1l, and any usual reinforcing structure, such as rods 82, see Fig. 8, may also be used, as will be readily understood by those skilled in the art.

It will also be manifest that my invention is applicable to fiat slab systems using metal or clay tiles in combination with concrete, and also to drop panel constructions, in short to any fiat slab construction. A drop panel is indicated at 84 in Figs. 6, 8 and l0.

It will be understood that my invention is applicable to structures in which the concrete column contains a structural column which is intended to carry the greater part of the load, the concrete column in such case serving more to encase the structural column and carry only a minor portion of the load. In the constructions shown in Figs. l to 3, and 6 and 7, for example, the H-irons 4 respectively could be extended downwardly to rest upon or be connected to the foundation, in which case they would constitute structural columns which would carry the greater part of the load as above referred to. It will be apparent that the interior structural column in such cases need not .have the form of an H-iron or I-iron, but may be of any suitable form or construction.

A grout hole may be left in the top plater and in the bottom plate of the head. Such a grout hole is shown centrally of the plates at 48.

lt will be apparent to those skilled in the art that my invention provides a reinforced construction by which the load is transferred directly from the Hoor to the concrete column or other support through the head encased in the slab and the vertical structural member encased in the column, or directly to the interior structural column by means of the head, where an interior struc tural column intended to carry the load is used. One of the main advantages of my construction lies in the fact that owing to its extreme strength, the use of capitals, usually employed at the junction of the tops of interior columns with the underside of the 'Y slab or of wall column brackets, usually employed at the junction of wall columns with said slab becomes unnecessary. This represents a substantial gain in space and eliminates the unsightly capitals or brackets heretofore considered necessary, so that my invention is applicable to structures to be used for purposes for which the structures embodying the conical capitals or projecting wall brackets heretofore used are unsuitable.

My invention is peculiarly adapted to structures subjected to unbalanced strains, as the anchoring of the head to the vertical structural member and the extensive surfaces of said head and member furnish a firm anchorage and offer adequate resistance to said strains.

It will be apparent that the use of my invention in no wise interferes with the usual reinforcing employed in the floors and columns and that any such reinforcing structure may be employed in conjunction with my invention. In Fig. 3 the usual reinforcing structure for the column is shown in the form of rods 46.

It will be apparent that my invention will not interfere with the use of drainage or other pipes within the floors, the use of such pipes being perfectly feasible within the floors of structures embodying my invention.

Other advantages than those specifically pointed out will readily suggest themselves to those skilled in the art.

It is to be understood that the expression member or structural member as applied to the vertical member within the column is to be interpreted in its broadest sense, and wherever used in this specification or claims may include a load bearing column within the concrete column as well yas a member extending only a certain disybe used to advantage separably in various combinations and sub-combinations. It will also be understood'that, while the invention is herein described as embodied in the details illustrated, it is not to be considered as ciroumscribed by or limited to these details, or any of them, but that said details may be variously modified within the true scope of theinvention which is definitely set forth by the claims.

Claims:

1. A reinforced concrete flat-slab construction, comprising reinforced concrete columns and a reinforced concrete floor slab and a metal structure embedded in said concrete, said metal structure comprising a vertical member embedded in the column and comprising an H-iron and a head embedded in the slaband rigidly secured to said vertical member, said head comprising top and bottom plates rigidly secured to said verticalmember and numerous radially disposed members of I-section whose inner ends are located between. and are rigidly secured to said plates.

2. A concrete construction comprising a concrete slab and supports therefor, and a metal column frame embedded in the slab and the supports, said frame comprising upper and lower plates and numerous radiA ally disposed members whose inner ends are located between and are secured to said plates and whose outer ends extend outwardly beyond said plates.

3. A concretev construction comprising columns and a concrete slab supported thereby, a meta-l column frame embedded in the concrete, said frame comprising a. head embedded in the slab and consisting of upper and lower plates and numerous radin ally disposed H-iron members whose inner ends are located between and are secured to said plates, and a vertical structural member secured to said` head and embedded in a column.

4. A concrete construction comprising` columns and a concrete slab supported thereby, a metal column frame embedded in the concrete, said frame comprising a. head embedded in the slab and consisting of upper and lower plates and numerous radially disposed Hi-iron members whose inner ends are located between and are secured to said plates, and a vertical structural member extending through and secured to said head and embedded in the column above and below said slab.

5. A metal column head frame comprising a head consisting of upper and lower plates and numerous radially disposed members whose inner ends are located between and are secured toy said plates and whose outer ends extend outwardly beyond said plates.

6. A metal column head frame comprising a head adapted to be embedded in a 10 concrete slab and consisting of upper and lowery plates and numerous radially disposed H-iron members whose inner ends are located between and are secured to said plates, and a vertical structural member extending through and secured to said head and adapted to be embedded in the concrete column.

In testimony whereof I have signed my name to this specication.

ROBERT M. HARDISON. 

